libera/#shirakumo - IRC Chatlog
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19:49:04
Colleen
<shinmera> I'm also intending on adjusting the reverb parameters at runtime. Wonder if that's feasible, too.
19:50:00
Colleen
<SAL9000> a trivial example: say you have a volume control (with unlimited slew rate)
19:50:34
Colleen
<SAL9000> if you apply volume adjustments at anything other than a zero-crossing point, you risk creating an audible discontinuity if the slew rate is high enough
19:51:26
Colleen
<SAL9000> delaying the input adjustments is "enough" for simple stuff like gain or eq -- not sure how to "de-zipper" something like a reverb, though.
19:52:03
Colleen
<shinmera> using something like https://www.musicdsp.org/en/latest/Filters/257-1-pole-lpf-for-smooth-parameter-changes.html
19:52:47
Colleen
<SAL9000> You can treat e.g. wet/dry mix as 2x gain and use step-at-zero-xing for those.
19:53:41
Colleen
<shinmera> I'm quite sure this implementation is overkill and I could get away with something much simpler.
19:54:27
Colleen
<shinmera> I want reverb that changes depending on how "tight" the environment is based on raycasts.
19:55:51
Colleen
<SAL9000> It's more suitable for a small set of environments (small space, large space, outdoors), but it could work if you generate new IR's based on raycast data?
19:56:24
Colleen
<SAL9000> Smoothing between different IR curves could be done as a crossfade between 2 different convolving filters
19:57:35
Colleen
<shinmera> The only thing i'm unsure about aside from the exact parameters is that one triangle thing in the diagram.
20:00:50
Colleen
<SAL9000> "Collision Rate / Material"... as in, the combination of "how many rays hit this surface" and "what kind of surface is it", perhaps?
20:02:00
Colleen
<shinmera> As for why all-pass, this article explains a bit https://www.earlevel.com/main/1997/01/19/a-bit-about-reverb/
20:03:09
Colleen
<shinmera> Anyway, I /am/ going to port that crazy reverb implementation, and will then prob do something custom for kandria.
20:07:03
Colleen
<SAL9000> aha, so APF basically rotates the phase of the signal w/o changing the amplitude
20:07:44
Colleen
<shinmera> kinda. I'm still struggling to get my head around the concept of 'phase' for PCM.